Whatman 13mm GD/X™ syringe filters are designed to enable easy filtration of samples up to 10mL. They are available in a wide variety of filter media choices with a polypropylene housing and utilize the most advanced construction methods and design features available today. This level of engineering provides for the finest disposable filtration devices possible. Whatman 13mm GD/X syringe filters contain a unique prefiltration stack of Whatman Multigrade GMF150 (10:1µm) and Grade GF/F prefilters. Multigrade GMF 150 is a combination of two glass microfibre filters in one.